<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<input type="text" placeholder="请输入1-100之间的整数">
<input type="button" value="猜一猜" onclick="f()">
<h3>
  结果:<span></span>
</h3>
<script>
  //得到一个1-100之间的整数
  let x = parseInt(Math.random() * 100) + 1;
  console.log(x);
  //得到文本框
  let i = document.querySelector("input");
  let s = document.querySelector("span");
  let n = 0;
  function f() {
    n++;
    if(isNaN(i.value)) {
      s.innerText = "输入错误!"
      return;
    }
    if(i.value > x) {
      s.innerText = "猜大了!";
    } else if(i.value < x) {
      s.innerText = "猜小了!";
    } else {
      s.innerText = "恭喜你, 第" + n +"次猜对了!" ;
    }
  }


</script>
</body>
</html>